Thomas james bkinsmead



(No Model.)

T. J. 'BRINSMEAD.

STRINGING PIANOS.

No. 319,188. Patented June 2,1885.

m a Z6 ATTORNEYS.

WITNESSES 7 JW O UNITE STATES Parana Orrrcn.

THOMAS JAMES BRINSMEAD, OF 18 WIGMORE STREET, COUNTY OF MIDDLE Y SEX, ENGLAND.

STRINGENG PlANOS.

SPECIFICATION forming part of Letters Patent No. 319,188, dated June 2, 1885.

Application filed October 24,1884. (No model.) Patented in England March 28, 1884, No. 5,609; in France May 5, 1884, No. 16l,908, and in Germany May 6, 18A, No. 251,461.

To all whom it may concern:

Be it known that I, THOMAS JilMns BRINs- MEAD, of the firm of John Brinsmead & Sons, 18 Wigmore Street, in the county of Middlesex, England, piano-forte manufacturers, a subject of the Queen of Great Britain, have invented an Improvement in Attaching the Strings to the lVrest-Pins or Turning-Pins of Piano-Fortes, of which the following is a specification.

My invention consists in the construction and arrangement of parts, as hereinafter fully described, and pointed out in the claims.

Figure 1 is a perspective view, and Fig. 2 is a longitudinal section of the screw-threaded wrest-pin, the string lying in the longitudinal groove in the pin. Fig. 3 is a longitudinal section of a pin in which the wire is carried first through a hole drilled obliquely in the inner end of the pin, and then through the longitudinal groove in the side of the pin. Figs. at and 5 are longitudinal sections of the pin,showing the mode of attaching the string thereto when a cap or its equivalent is used to retain the string in place. Fig. 6 is a longitudinal section, and Figs. 7 and 8 cross-sections, of a wrest-pin having a longitudinal perforation, through which the string is wholly carried, instead of lying in the external groove. Fig. 9 is a face and edge View of the washer for preventing the pin from turning. Fig. 10 is a vertical section of a piano-forte frame showing the form of the wrestplank and the position occupied by the wrest-pins.

The same letters of reference indicate the same parts in all the figures.

a is the wrest or turning pin, of steel or other metal, screw-threaded, except at its up per or outer end, throughout its length.

I) is a nut screwing upon the pin a.

c is the washer, and d is the wrest-plank. The wrest plank d is a bar or rib cast in one with the metal frame of the instrument, and forms the subject of another application for Letters Patent of even date herewith. Although made of metaLthe usual designation of Wrest-plank is retained. The wrest-plank has holes drilled in it, through which the pins a pass freely, and it also has recesses on its upper or outer face to receive a portion or the whole of each of the washers 0, as the case may be.

The pins a have each, by preference, a longitudinal groove, 0, cut in it to receive an internal feather, f, formed on the washer a, there being sufficient space between the feather and groove to afford room for the string which lies in the said groove-c. Fig. 3 shows the preferred form of the pin, which has an oblique hole, 6, drilled from the center of its inher end and running out into the groove 0. Through this hole the string is passed into the groove, and the hole being central at the inner end of the pin, the stress of the string is truly axial.

The washer, if of disk form, has a lug, 9, formed on its under face, which lug is a continuation of the feather f, and is received in a corresponding recess formed in the upper or outer face of the wrestplank d.

The groove 0 in the pin is of sufficient depth to allow the ordinary wire string, 13, to pass quite free of the washer and of the nut.

At a short distance from its outer end the pin has a hole, 70, drilled in it at the opposite side to the groove 6, and of a size to just receive the end of the string. As will be seen in the drawings, this hole extends partly through the pin, and is made at right angles to its longitudinal axis, a cap or ferrule, Z, being used to retain the end of the string in this hole. The pin has also a longitudinal groove, m, extending from its outer end to the hole 70, in which the part of the string beneath the cap or ferrule lies.

In Figs. 6, 7, and 8 the pin has a central longitudinal perforation, m, for the wire to pass through, in addition to the groove 0, for the washer to engage with, the mode of securing the string being the same as above described; or, instead of a groove, 6, the pin may have a flat, c upon it, as shown in Fig. 8, the washer havinga corresponding flat, instead of the feather f,- but I do not prefer this form.

By referring to Figs. 4, 5, and 6 it will be seen that the wire, after being passed through the groove of the pin, is bent over the outer end, and then, by means of nippers, which also serve as a gage to measure the exact ICO length of wire required, is first bent at the proper point for the final bend, and is then out near the end at the exact position, to enable it to be tucked into thehole 7c,after which the cap Z is applied to hold it in place, if required.

The tension of the strings is adjusted for tuning by means of a tuning-key or hammer, having a long pipe or barrel adapted to pass over the outer end of the pin with its cap or ferrule Z, and to fit upon and turn the hexagonal or other nut, 1).

Having now particularly described and ascertained the nature of my said invention, and in what manner the same is to be performed, I declare that what I claim is- 1. In apiano-forte, the combination, with each string, of a screw-threaded wrest-pin or tuning-pin in line with the string, a nut on said pin and bearing against the frame, means for preventing the pin from turning,while permitting its longitudinal motion, and means, substantially as described, of carrying the string through or alongside of the pin, and of readily attaching it to the pin at a point beyond the nut, and at or near the outer or farther end of the pin, as set forth.

2. The combination, with the wrestplank and rib thereon, of the screw-pins a, passing through the said rib in line with the strings, means for connecting the strings and screws, adj usting-nuts b, washers c, and a feather and groove or analogous connection between said washers and screws, and ribs, whereby the washers and pins are prevented from rotary movement, and longitudinal movement permitted to the screw, substantially as herein shown and described.

3. In a piano-forte, the combination, with each string, of a screwpin in line with the string, and having a longitudinal groove at one side, and means of attaching the string to the outer end of the pin, a nut screwing on the pin and supporting the tension of the string, a washer having a feather engaging in the groove of the pin and engaging with the wrestplank, so as to be prevented from turning, substantially as and for the purpose specified.

4:. In apiano-forte, the combination,with a screw-threaded wrest or tuning pin placed in line with and provided with a longitudinal passage for the string, a transverse hole for receiving the end of the strings, a string passing lengthwise of the pin and bent across the outer end of the pin, and a cap, ferrule, or its equivalent for retaining the end of the string in said hole, substantially as shown and described.

THOMAS JAMES BRINSMEAD.

Witnesses:

J Ol-IN DEAN, PnRoY R. GOLDRING,

Bothof 17 Graccclmrch Street, London. 

